The western U.S. is being hit with one of the worst heat waves in years. Temperature could approach 130 degrees in California's Death Valley, close to the hottest ever recorded on earth --134 degrees.

The National Weather Service said temperatures could reach 118 degrees in Phoenix and 117 degrees in Las Vegas on Sunday.

The heat will spread as far north as parts of Wyoming and Idaho. Temperatures are expected to go into the 100s in the Boise area this weekend.

"This is the hottest time of the year but the temperatures that we'll be looking at for Friday through Sunday, they'll be toward the top," meteorologist Mark O'Malley said. "We'll be at or above record levels in the Phoenix area and throughout a lot of the southwestern United States."

"It's going to be baking hot across much of the entire West," he warned.

The record heat heightens concerns for wildfires.

Jennifer Smith, a spokeswoman for the National Interagency Fire Center based in Idaho, said officials are concerned about the potential for wildfires "in the four corners region where the borders of Colorado, New Mexico, Utah and Arizona intersect."